no_std HAL for the ESP32-H2 from Espressif. Implements a number of the traits defined by embedded-hal.
This device uses the RISC-V ISA, which is officially supported by the Rust compiler via the riscv32imac-unknown-none-elf target. Refer to the Getting Started section below for more information.
The compilation target for this device is officially supported via the stable release channel and can be installed via rustup:
shell
$ rustup target add riscv32imac-unknown-none-elf
The IDF second stage bootloader is the default bootloader solution.
By default, espflash fetches the required binaries (Bootloader and Partition Table) and flashes them onto the target device together with the Rust-based application firmware image.
Direct Boot allows an application stored in the External Flash to be executed directly, without being copied into Internal RAM.
Build the Hello World example with support for Direct Boot:
shell
cargo build --release --example hello_world --features direct-boot
Then proceed to generating the application binary and flashing it onto the target device:
shell
cargo espflash --release --format direct-boot --features direct-boot --example hello_world --monitor
The ROM Bootloader will identify the firmware image built with Direct Boot support and load it appropriately from the External Flash:
shell
ESP-ROM:esp32h2-20221101
Build:Nov 1 2022
rst:0x1 (POWERON),boot:0xc (SPI_FAST_FLASH_BOOT)
Hello world!
Hello world!
Hello world!
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